Messages in this thread Patch in this message | | | From | Logan Gunthorpe <> | Date | Wed, 27 Oct 2021 10:41:51 -0600 | Subject | Re: v5.15-rc7 AMD no kernel dump, spews "scsi_dma_map failed: request for 36 bytes!" |
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Hi,
On 2021-10-27 10:08 a.m., Marshall Midden wrote: > v5.15-rc7 AMD no kernel dump, spews "scsi_dma_map failed: request for 36 bytes!" > > With v5.15-rc (1 through 7), AMD processor kernel crash dumps do not occur, > instead spews: > "scsci_dma_map failed: request for 36 bytes!" > Works on Intel machines, and in v5.14.0 (and v5.14.14) - as well as previous > kernels (down to v5.3.x.) > git bisect torvalds repository shows: dabb16f67215918c48cf3ff1fc4bc36ca421da2b > Reverse patch to tag v5.15-rc7 allows kernel crash dumps to occur/happen. >
On careful review I think I see what might be causing this. Can you please try the following patch?
Thanks,
Logan
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diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index cd0f1a593997..3bfb5da87802 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1028,7 +1028,8 @@ static int iommu_dma_map_sg(struct device *dev, struct sc>
if (static_branch_unlikely(&iommu_deferred_attach_enabled)) { ret = iommu_deferred_attach(dev, domain); - goto out; + if (ret) + goto out; }
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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